Buggy code:
public class DataLoader { public static final String rutaUsuarios = ".//data//yelp_academic_dataset_user.json" ; public static final String rutaTips = ".//data//yelp_academic_dataset_tip.json" ; public static final String rutaNegocios = ".//data//yelp_academic_dataset_business.json" ; public static final String rutaCheckins = ".//data//yelp_academic_dataset_checkin.json" ; public static final String rutaReviews = ".//data//yelp_academic_dataset_review.json" ; public static final String rutaNegociosTest = ".//data//yelp_academic_dataset_business_test.json" ; public static final String rutaCheckinsTest = ".//data//yelp_academic_dataset_checkins_test.json" ; public static final String rutaUsuariosTest = ".//data//yelp_academic_dataset_user_test.json" ; public static final String rutaReviewsTest = ".//data//yelp_academic_dataset_reviews_test.json" ; public static final String rutaArchivoDataModel = ".//data//reviews_info.txt" ; public static EntityCollector colector ; private static String rutaCategorias = ".//data//categories.txt" ; public static void main ( String [ ] args0 ) { } private static void buildAttributes ( ) { } private static void buildCategories ( ) { } private static void cargarReviews ( ) { try { BufferedReader br = new BufferedReader ( new FileReader ( DataLoader . rutaReviews ) ) ; System . out . println ( "Lee<seq2seq4repair_space>el<seq2seq4repair_space>archivo" ) ; String line = "" ; PrintWriter writer = new PrintWriter ( DataLoader . rutaArchivoDataModel , "UTF-8" ) ; while ( ( line = br . readLine ( ) ) != null ) { try { Review review = new Review ( ) ; System . out . println ( line ) ; JSONParser jsonParser = new JSONParser ( ) ; JSONObject jsonObject = ( ( JSONObject ) ( jsonParser . parse ( line ) ) ) ; System . out . println ( jsonObject . toJSONString ( ) ) ; String business_id = ( ( String ) ( jsonObject . get ( "business_id" ) ) ) ; String user_id = ( ( String ) ( jsonObject . get ( "user_id" ) ) ) ; long stars_long = ( ( Long ) ( jsonObject . get ( "stars" ) ) ) ; double stars = ( ( double ) ( stars_long ) ) ; <START_BUG> writer . println ( ( ( ( ( business_id + "<seq2seq4repair_space>" ) + user_id ) + "<seq2seq4repair_space>" ) + stars ) ) ; <END_BUG> } catch ( Exception e ) { System . out . println ( ( ( ( "EXCEPTION<seq2seq4repair_space>THROWN:<seq2seq4repair_space>" + ( e . getClass ( ) ) ) + "<seq2seq4repair_space>:::<seq2seq4repair_space>" ) + ( e . getMessage ( ) ) ) ) ; System . out . println ( "Ignoring<seq2seq4repair_space>Line..." ) ; e . printStackTrace ( ) ; } } writer . close ( ) ; br . close ( ) ; } catch ( FileNotFoundException e ) { System . out . println ( "Error<seq2seq4repair_space>loading<seq2seq4repair_space>users:<seq2seq4repair_space>file<seq2seq4repair_space>not<seq2seq4repair_space>found." ) ; e . printStackTrace ( ) ; } catch ( IOException e ) { System . out . println ( ( "IO<seq2seq4repair_space>Exception:<seq2seq4repair_space>" + ( e . getMessage ( ) ) ) ) ; e . printStackTrace ( ) ; } } public static void cargarTips ( ) { } private static void cargarCheckins ( ) { } private static void cargarUsuarios ( ) { } private static void cargarNegocios ( ) { } }

Fix:
writer . println ( ( ( ( ( business_id + ";" ) + user_id ) + ";" ) + stars ) ) ;